試験片表面観察に基づく微小疲労き裂成長予測モデルの検討
Approach to establish micro crack growth prediction model based on surface observations of fatigue test specimen
著者:
阿部 茂樹 Shigeki ABE 西 朋秀 Tomohide NISHI 中村 隆夫 Takao NAKAMURA 釜谷 昌幸 Masayuki KAMIYA
発刊日:
公開日:
crack growthCUFdesign codefatigue damagemicro cracksystem safety evaluation
概要
After Fukushima Daiichi accident, nuclear power plants are required to ensure the system safety with long te rm operation. Present design code requires the assessment of CUF (cumulated usage factor) to prevent the occ rence of fatigue damage. However, it is difficult to introduce the concept of CUF into the system safety eva luation which needs probabilistic risk assessment. For the probabilistic evaluation of fatigue failure, thi s study intends to show the prediction of micro crack growth by simulation. A low-cycle fatigue test was con ducted in air at room temperature under constant cyclic strain range and crack initiation and crack growth w e examined by replica investigation. These steps were modeled for the input of simulation. After confirming the applicability of this model, the prediction of crack growth will be evaluated by this simulation model.
